Under-water exhaust for launches.



H. .0. NELSON & Wu H. MULLINS. v UNDER WATER EXHAUST FOR LAUNCHES.

APPLICATION IILEIJ JAN. 15, 1906.

Patented Oct. 6, 1908.

INVENTOFIS.

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' THENfRY NELSON AND wiL iAM H. MULLINS, or SALEM, OHIO.

UNDER-WATER n xnaus'rton Lamioms.

Tooll whoin'tt moi concern: Be it known that W6,'HENRY C. NELSON andWILLIAM MULLINS, residents of 1 Salem, in the county "of Columbiana andState f-Ohi'0,= have ;invented 'a new and useful Improvement in UnderWater Exhausts for"- Launches and we do "hereby 'de-" clare thefollowing to be a fullyclear, and

- exact description thereof.

Our invention relates to under-water exhausts for launches'or motorboats.

The object "of 'our invention" is to" provide means for conveying thewaste {gases from i theexhau'st of the "'e'ngine'to a point at therearof the-boat and below the waterline so'that by" the time the'gaseshave'iarrive'd at the point of discharge into thewater they emergetherefrom with practically no noise or disturbance so that theobjectionable feature ofi'notor boats propelled by gas engines,"dueftothe noise of theflexhaust' is practically -ove'r'c0me; v

A furtherobje'ct of our inventionis to so construct and arrange "thismeans for discharging" the gases at the stern of the boat and beneaththe surface ofithe water that it is not necessary to change the forinofthe construction of the ordinary boat or launch or cut into the body ofthe' same so as toweaken pr .mar theqappearance of the same: 1. f P

In carrying out our invention therefore we take advantage of theconstruction now commonly employed of A having the propeller shaftrunning up through the body of the boat so as to be directly geared tothe englne, said shaft passing through suitable stuffing boxes andthrough a shaft-casing,

which shaft-casing we employ as a conduit for the gases discharged fromthe gas cham ber of the engine and We connect said casing with the gaschamber at one end with a suitable discharge pipe at its opposite end,so that in this way we dispense with such extra connections as mightotherwise be necessary for conveying the discharged gases from thecylinder of the engine to a point at the stern of the boat.

To enable others skilled in the art to make and use our invention we"will describe the same more fully, referring to the accompanyingdrawing in which Figure 1 is a vertical section of the rear end of asuitable boat or launch showing our invention applied thereto; and Figs.2 and 3 are enlarged views.

1 Specification of Letters Patent.

of "the figures.

In the drawing the numeral 2 designates the rearend of a suitable boator launch to be propelled by the gas engine 30f any suitableconstruction. It is not deemed necessary toillustrate and describethegas engine in detail, as any suitable form of gasjengine may of coursebe employed. WVithin'the gas engine 3 is a suitable piston aand thecarrying off the exploded gases. The-cylinde'r'or body of the engine isprovided with the ordinary water jacket? with the dischargeport 7. Thepropeller shaft 8 is connected up directly with the engine shaft iPatentedOct. 6, 190a. Application filed. Jannary 15, 1906. Serial No.296,179. 1

' Like numerals indicate like parts in each' gas chamber 5' with theexhaust port 6 for and said propeller shaft extends in an"in-;

cli'ned direction through the propeller shaft casin 9 which is providedat each end with suita 1e stuffing boxes 10 and'l'l. o The propellershaftextends' a suitable distance beyond the lower stufiing box 11,being supported by the frame12 and said propeller ordinary propeller 13.The'stufling box 10: forms part of a casting 14 which has the inclinedextension15 which is connected to the engine cylinder. This extension 15has: the central passage 16 which connects with shaft carries 'at itsextreme outer end the the'exhaust port 6 of the engine and; in addi tionhas the outer annular passage or well 17" which connects with the port 7of the water jacket 7 of the engine. The. lower end of the passage 16 ofthe extension 15 and the well 17 communicate with the passage 18 in thepropeller shaft casing 9. At the lower end of the casing 9 is thekeel-casting 19 .in

which the stufling box 11 is formed and said keel-casting in additionhas the by-passage 20 which connects the passage 18 with the exhaustpipe 21. This exhaust pipe is supported close to the bottom of the boatand extends out to a point adjacent to the stern, said pipe being belowthe water line. The outer end of the exhaust pipe 21 is open and formsthe exhaust discharge 22. A suitable rudder 23 is supported at the sternin the usual manner.

When the engine is running to drive the propeller shaft and impartmotionto the boat the burned gases will pass from the chamber 5 through theport 6 into the passage 16, while at the same time the water from thewater jacket 7 will pass through the Well 17 and will join the wastegases at. the point where the passage 16 and well 17 unite with thepassage 18 in the propeller shaft casing. The water and gas w1ll bedriven through the passage 18 and through the keel casting 19 into theexhaust pipe 21 to be discharged from the exhaust discharge 22. By thetime the gases have reached the exhaust discharge they will have had anopportunity to expand so that they will not e ejected with a loudexplosion, while at the same time the exhaust being below the water linethe water will have a tendency to muflie the exhaust and further reducethe noise which has heretofore been so objectionable in motor boats ofthis character. The dischar e of the waste gases is made withpracticalfy no sound and the boat moves along in the water evenlyandsmoothly.

From the fact that we take advantage of the propeller shaft casing toconvey the waste gases to the exhaust pipe -in the rear makes itpossible for us to appl our improved apparatus to the boat without thenecessity of using extra pi e or of making additional openings in theody of the boat to receive the pipe for conveying the gases to theexhaust pipe. This construction of ours is therefore applicable to anyboat which is already provided with the ropeller shaft casing, as itrequires very little change to add the other parts necessary to make thestructure complete.

It will be found in operation that as the boat moves through the waterthe propeller of the boat will act to cause a suction at the outer endof the exhaust pipe which will have a further tendency to quicken andaid the discharge of the gas and water contained within the exhaustpipe. This will further prevent the backin of the water-into the exhaustpipe and t us prevent the proper discharge of the gases.

What we claim is:

1. In a motor-boat, the combination of a gas-engine, a propeller shaftcasing, and means for connecting up said casing w1th the exhaust port ofsald engine and with an under-water exhaust.

2. In a motor-boat, the combination of a gas-engine, a propeller shaftcasin a conduit connected to the exhaust of sai engine, and to saidcasing, and an exhaust-pipe connected to said casing and extending belowthe water-line.

3. In a motor-boat, the combination of a gas-engine, a propeller shaftcasing, a conduit connected to said as-engine and to said casing, saidconduit iaving two assages therein, one connecting with the ex must ofsaid engine and the other with the wateracket,'both leading into saidcasing, and an exhaustipe leading from said casing to a point be ow thewater-line.

4. In a motor-boat, the combination of a gas-engine, a propeller shaftcasing, a conduit connected to said casing and to the exhaust of saidengine, and an exhaust-pipe connected to said casing and extending out{o the rear end of said boat below the waterme. i

5. In a motor-boat,'the combination of a as-engine, a propeller shaftcasing, a conuit connected to said casing and to the exhaust of saidengine, a connection at the other end of said casin forming a stufiing--box and having an out et, and an exhaustipe connected tosaid outletextending beow the water-line.

In testimony whereof we, the said HENRY G. Manor: and WILLIAM H.MULLINs, have hereunto set our hands.

HENRY o. NELsoN. WILLIAM H. MULLINS.

Witnesses:

F. J. MULLINB, J. H. BLACKBURN.

